These are bugged. Theu dont attack you. Also theyre in a weird spot and there's only two on the whole map? Seems like something that wasn't planned. anyway, super annoying if youre trying to get S knowledge since you have to wait for respawn or server change cd.

These are not bugged and there are more than 2. Below the location of Aerith's journal you can find several groups of them if you follow the channel of lava.